Ford Explorer P0455: EVAP System → Leak Detected (Large)
The most frequent trouble code with the Ford Explorer Is the Code P0455. This code is used to refer to the trouble code for your Explorer that you get when it's plugged in to an OBD2 scanner. The number has to do to with the emissions system. If there are any problems, P0455 is indicated. Large leak In the evaporative emissions control system (EVAP). This code is often found with or related to other codes such as P0420 and P0430.
P0455: EVAP System → Leak Detected (Large)
Your Explorer's driveability is generally not affected by P0455. Certainly anytime the service engine soon light is on, it’s good to deal with it as soon as possible though.
Ford Explorer P0455 Definition
P0455 refers to a general OBDII trouble code. It means that no matter what make or model vehicle you have, this code will still mean the exact same thing (Explorer and not). Technically the code is:
System Gross Leak Evaporative Emission System
The EVAP system collects fuel vapor from fuel tanks and then sends it to the intake to ignite the engine in normal combustion. When there is a large leak in the Ford Explorer’s EVAP system, it will throw the P0455 OBDII Code.
Ford Explorer P0455 OBDII Code Symptoms
The P0455 code is usually not accompanied with any other symptoms than those listed. Smells like gas And the service engine soon light. It is possible to notice a slight dip in fuel economy.
Particular attention should be paid to the fuel tank or fuel filler tube smell.
The EVAP process deals with fuel vapors directly. If these vapors are leaking from the system, you’ll often smell them faintly while operating the vehicle.
Explorer P0455 Trouble Code Causes
The P0455 code can be triggered by many factors in Ford Explorer. The most frequent problems that trigger this code are:
- Hose for Evap System– The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. This can lead to the P0455 code. It should be checked for tears or holes. This is the main problem that can cause the code.
- Vapor Canister Purge Valve– One of the most common causes of the P0455 code is the vapor canister purge valve. It’s really easy to replace. There are some clips you will need to look for and then remove.
- A Faulty Canister of Charcoal– The charcoal canister is often the cause of P0455.
- Fuel Tank Sending Unit– It is possible for the gasket that attaches the fuel sending unit to the gas tank to go bad. This could cause a drop in tank pressure which can throw off the code.
- Fuel Cap– A bad fuel cap can cause the code to be thrown for sure. Often, you’ll get a message informing you that the fuel cap is off even when it is on. You may not get the message but a P0455. This will save you time and money.
- Fuel Filler Neck– There is often a gasket where the fuel filler neck connects with the gas tank. It is possible for this gasket to dry, particularly if vehicles spend a lot of time in dry environments. When it dries out, the fuel tank can’t hold pressure anymore.
Ford Explorer Diagnostics - P0455
The mechanic will have a lot of different tools at his disposal in order to determine the cause of your Ford Explorer P0455. The most commonly used methods to diagnose this code are:
- In most cases, the mechanic will check for any additional trouble codes. A mechanic will usually check for additional trouble codes to help diagnose the problem. That’s because when they appear together in certain combinations, there will often only be only a few conditions that will throw any combination of codes at one time.
- Once the mechanic has determined the trouble codes associated with P0455, he or she will usually Take a look at the EVAP system. It includes the purge valve and line as well as the canister.
- To ensure that the cap can withstand pressure, the mechanic will check it. If you are getting a warning that your gas cap is off, even when it’s on, replacing it will more than likely clear this code.
- Monitor and check the pressure in your fuel tank.
- The mechanic will then perform the following tests after completing the above-mentioned checks:
- A smoke test, and they’ll use a scan tool to confirm that the EVAP solenoids and valves are operating properly.
Here’s a pretty good video on diagnosing these leaks from Scotty Kilmer, if you are interested:
While the trouble code may state that there is a “large leak” in the EVAP system of your Ford Explorer, the actual leak will most likely still look rather small. The “large” really is referring to how much pressure is being lost.
The Most Popular P0455 Fixes
Below are the top Explorer P0455 solutions:
- Replacing the gas cap
- Replacement for EVAP Line
- Replace charcoal canister
- Change the fuel tank
It is best to begin with the gas cap, and then work your way up to the fuel tanks. The gas cap is the most difficult and cost-effective item to replace.
Here’s a great video on How to test your gas tank.
You will need to find the cause of your Ford Explorer throwing the code P0455. We trust this helped. You can add any additional information by leaving a comment.
Do you consider P0455 to be a serious concern?
While P0455 is not going to cause the Explorer’s engine to stop running, it should not be treated lightly. There could be fuel contamination. Check your fuel level to make sure it is not leaked. You should immediately take it in for repair or replacement.